Well not all N1 trannies come with the Nismo LSD and quicker gears. Most are just like the standard SR16VE
Well if you got a tranny with a Nismo LSD which cost $750 and you cant get them any more. The Nismo N1 tranny is by far the best tranny for NA. You dont need B15 and P11 trannys for NA as they dont have high torque output that will break the 3rd gear so....
Consider a SR16VE tranny $600
Nismo LSD $750
You pay someone to install it $200
and you still dont have the wicked gear ratios.